What is 8/13 plus 7/9?
8/13 plus 7/9 equals 163/117 (or 1 46/117 as a mixed number) (or 1.393162 in decimal form). Learn the step-by-step solution to add 8/13 and 7/9 using Least Common Denominator and simplification.
Exact Answer
8/13 + 7/9 = 163/117
Simplified Fraction
163/117
Mixed Number
1 46/117
Decimal Value
1.393162
Percentage
139.3162%
Step-by-Step Solution: 8/13 + 7/9
Step 1
Find the Least Common Denominator (LCD)
The denominators 13 and 9 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 13 × 9 = 117.
LCD(13, 9) = 117
Step 2
Convert to Equivalent Fractions with Common Denominator 117
Multiply the numerator and denominator of 8/13 by 9, and multiply the numerator and denominator of 7/9 by 13 so both fractions share the common base 117.
8 × 9/13 × 9 = 72/117 and 7 × 13/9 × 13 = 91/117
Step 3
Add the Numerators
Now add the numerators (72 + 91 = 163) and keep the common denominator 117 unchanged.
72 + 91/117 = 163/117
Step 4
Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 163 and 117 is 1, confirming that 163/117 cannot be reduced further—it is already in its simplest irreducible form.
163/117
Step 5
Convert Improper Fraction to a Mixed Number
Since the numerator (163) is greater than the denominator (117), divide 163 by 117: it goes in 1 whole time(s) with a remainder of 46, giving the mixed number 1 46/117.
163/117 = 146/117
Step 6
Decimal & Percentage Representation
Dividing the numerator 163 by denominator 117 produces a repeating decimal (approximately 1.393162, or 139.3162%).
163 ÷ 117 = 1.393162 (139.3162%)
Visual Representation
The diagram below illustrates 8/13 plus 7/9 visually:
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Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Lowest Terms Fraction | 163/117 |
| Mixed Number Form | 1 46/117 |
| Decimal Form | 1.393162 |
| Percentage | 139.3162% |
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Frequently Asked Questions
What is 8/13 plus 7/9 as a fraction?
8/13 + 7/9 in simplest fraction form is 163/117 (or 1 46/117 as a mixed number).
What is 8/13 plus 7/9 as a decimal?
8/13 + 7/9 converted to a decimal is 1.393162.
What is 8/13 plus 7/9 as a percentage?
8/13 + 7/9 expressed as a percentage is 139.3162%.
How do you write 8/13 plus 7/9 as a mixed number?
Because the numerator is greater than the denominator, the improper fraction 163/117 can be written as the mixed number 1 46/117.
Does 8/13 plus 7/9 result in a terminating or repeating decimal?
It results in a repeating decimal (approximately 1.393162...) because the denominator contains prime factors other than 2 and 5.